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d2912cb1 | 1 | // SPDX-License-Identifier: GPL-2.0-only |
146c8688 DA |
2 | /* |
3 | * CRC vpmsum tester | |
4 | * Copyright 2017 Daniel Axtens, IBM Corporation. | |
146c8688 DA |
5 | */ |
6 | ||
7 | #include <linux/crc-t10dif.h> | |
8 | #include <linux/crc32.h> | |
9 | #include <crypto/internal/hash.h> | |
10 | #include <linux/init.h> | |
11 | #include <linux/module.h> | |
12 | #include <linux/string.h> | |
13 | #include <linux/kernel.h> | |
14 | #include <linux/cpufeature.h> | |
15 | #include <asm/switch_to.h> | |
16 | ||
17 | static unsigned long iterations = 10000; | |
18 | ||
19 | #define MAX_CRC_LENGTH 65535 | |
20 | ||
21 | ||
22 | static int __init crc_test_init(void) | |
23 | { | |
24 | u16 crc16 = 0, verify16 = 0; | |
25 | u32 crc32 = 0, verify32 = 0; | |
26 | __le32 verify32le = 0; | |
27 | unsigned char *data; | |
28 | unsigned long i; | |
29 | int ret; | |
30 | ||
31 | struct crypto_shash *crct10dif_tfm; | |
32 | struct crypto_shash *crc32c_tfm; | |
33 | ||
34 | if (!cpu_has_feature(CPU_FTR_ARCH_207S)) | |
35 | return -ENODEV; | |
36 | ||
37 | data = kmalloc(MAX_CRC_LENGTH, GFP_KERNEL); | |
38 | if (!data) | |
39 | return -ENOMEM; | |
40 | ||
41 | crct10dif_tfm = crypto_alloc_shash("crct10dif", 0, 0); | |
42 | ||
43 | if (IS_ERR(crct10dif_tfm)) { | |
44 | pr_err("Error allocating crc-t10dif\n"); | |
45 | goto free_buf; | |
46 | } | |
47 | ||
48 | crc32c_tfm = crypto_alloc_shash("crc32c", 0, 0); | |
49 | ||
50 | if (IS_ERR(crc32c_tfm)) { | |
51 | pr_err("Error allocating crc32c\n"); | |
52 | goto free_16; | |
53 | } | |
54 | ||
55 | do { | |
56 | SHASH_DESC_ON_STACK(crct10dif_shash, crct10dif_tfm); | |
57 | SHASH_DESC_ON_STACK(crc32c_shash, crc32c_tfm); | |
58 | ||
59 | crct10dif_shash->tfm = crct10dif_tfm; | |
60 | ret = crypto_shash_init(crct10dif_shash); | |
61 | ||
62 | if (ret) { | |
63 | pr_err("Error initing crc-t10dif\n"); | |
64 | goto free_32; | |
65 | } | |
66 | ||
67 | ||
68 | crc32c_shash->tfm = crc32c_tfm; | |
69 | ret = crypto_shash_init(crc32c_shash); | |
70 | ||
71 | if (ret) { | |
72 | pr_err("Error initing crc32c\n"); | |
73 | goto free_32; | |
74 | } | |
75 | ||
76 | pr_info("crc-vpmsum_test begins, %lu iterations\n", iterations); | |
77 | for (i=0; i<iterations; i++) { | |
80d04b7f GS |
78 | size_t offset = prandom_u32_max(16); |
79 | size_t len = prandom_u32_max(MAX_CRC_LENGTH); | |
146c8688 | 80 | |
146c8688 DA |
81 | if (len <= offset) |
82 | continue; | |
80d04b7f | 83 | prandom_bytes(data, len); |
146c8688 DA |
84 | len -= offset; |
85 | ||
86 | crypto_shash_update(crct10dif_shash, data+offset, len); | |
87 | crypto_shash_final(crct10dif_shash, (u8 *)(&crc16)); | |
88 | verify16 = crc_t10dif_generic(verify16, data+offset, len); | |
89 | ||
90 | ||
91 | if (crc16 != verify16) { | |
92 | pr_err("FAILURE in CRC16: got 0x%04x expected 0x%04x (len %lu)\n", | |
93 | crc16, verify16, len); | |
94 | break; | |
95 | } | |
96 | ||
97 | crypto_shash_update(crc32c_shash, data+offset, len); | |
98 | crypto_shash_final(crc32c_shash, (u8 *)(&crc32)); | |
99 | verify32 = le32_to_cpu(verify32le); | |
100 | verify32le = ~cpu_to_le32(__crc32c_le(~verify32, data+offset, len)); | |
101 | if (crc32 != (u32)verify32le) { | |
102 | pr_err("FAILURE in CRC32: got 0x%08x expected 0x%08x (len %lu)\n", | |
103 | crc32, verify32, len); | |
104 | break; | |
105 | } | |
106 | } | |
107 | pr_info("crc-vpmsum_test done, completed %lu iterations\n", i); | |
108 | } while (0); | |
109 | ||
110 | free_32: | |
111 | crypto_free_shash(crc32c_tfm); | |
112 | ||
113 | free_16: | |
114 | crypto_free_shash(crct10dif_tfm); | |
115 | ||
116 | free_buf: | |
117 | kfree(data); | |
118 | ||
119 | return 0; | |
120 | } | |
121 | ||
122 | static void __exit crc_test_exit(void) {} | |
123 | ||
124 | module_init(crc_test_init); | |
125 | module_exit(crc_test_exit); | |
126 | module_param(iterations, long, 0400); | |
127 | ||
128 | MODULE_AUTHOR("Daniel Axtens <dja@axtens.net>"); | |
129 | MODULE_DESCRIPTION("Vector polynomial multiply-sum CRC tester"); | |
130 | MODULE_LICENSE("GPL"); |